Background and Aim: Specific language impairment (SLI) is one of the most prevalent developmental language disorders which is less considered in Persian researches. The aim of this study was to investigate the differences in some morpho-syntactic features of speech and other language skills between Persian children with specific language impairment and their normal age-matched peers. Moreover, the usefulness of the test of language development-3 (TOLD-3), Persian version, as a tool in identifing Persian-speaking children with this impairment, was investigated.
Methods: In a case-control study, the results of the test of language development and speech samples analysis of 13 Persian-speaking children (5 to 7 years old) with specific language impairment were compared with 13 age-matched normal children.
Results: The results of this study showed that there were significant differences between the scores of specific language impairment group and control group in all measured aspects of the TOLD-3 (p<0.001) the children with specific language impairment had a shorter mean length of utterance (p<0.001) and made less use of functional words in their speech (p=0.002) compared with their peers.
Conclusion: Such as specific language impairment children in other languages, all language abilities of Persian-speaking children with specific language impairment are less than expected stage for their age. Furthermore, the Persian version of TOLD-3 is a useful assessment instrument in identifying children with specific language impairment which is comparable to the

Background and Aim: Grammatical skills development of hearing-impaired children depends on using appropriate educational rehabilitation programs. This study aims to investigate the effectiveness of linguistic plays on the grammatical skills in hearing-impaired children with hearing aids.

Methods: Ten hearing-impaired children with hearing aids, aged between 5 and 7, were randomly assigned to two groups (5 children in each group). Each treatment group received 12 sessions on linguistic plays. The grammatical skills of these children were evaluated via the TOLD-P: 3 (Persian version) in addition, their level of intelligence was assessed by the Raven test.

Results: The difference between the scores of both control and treatment groups revealed a statistically significant difference in grammatical skills (t=7.61, p=0.001) and three subskills of the children who participated in the linguistic plays. These subskills include syntactic understanding (t=3.16, p=0.013), sentence imitation (t=1.71, p=0.006), and morphological completion (t=6.55, p=0.001). In other words, the findings suggest that linguistic plays have a significant impact on the improvement of the aforementioned skills in hearing-impaired children.

Conclusion: Results suggest that it would be beneficial to include linguistic plays as part of routine rehabilitation programs as a means of improving the grammatical difficulties of children. After partaking in linguistic plays, children significantly improved their ability to comprehend the meaning of sentences and also to recognize, understand, and use common Persian morphological forms.